des=fdf['dd_CONCAT_CHAR_ATP_TARGET'].unique()
    ddf=pd.DataFrame()

    for i in des:
        df1=fdf[fdf['dd_CONCAT_CHAR_ATP_TARGET']==i].reset_index()
        loop = True
        for k in range(len(df1)):
            date = df1.loc[k, 'dd_VALIDITY_DATE']
            pathlist = df1.loc[k, 'path']
            pathlist = pathlist.split('/')
            date2 = date
            pathlistn = pathlist[1:]
            pa = '/'.join(pathlistn)
            df1.loc[df1['path'] == pa, 'dd_VALIDITY_DATE'] = date
        ddf = ddf._append(df1)

    ddf=ddf.drop(['index'], axis=1)